Strip NOSUID and NOSGID export options

These options don't make sense. As options with names like that, they
are client side mount options.

We do need to scrub the code for proper handling of S_ISGID and S_ISUID.

Signed-off-by: Frank S. Filz <ffilzlnx@mindspring.com>
Strip unused access_type, new_access_list, and seckey fields from exportlist_t

These fields are not used anymore and are left over from the export
permissions work.

Signed-off-by: Frank S. Filz <ffilzlnx@mindspring.com>